Cation Distribution and Magnetic Interactions in Zn-Substituted Fe(Cu)Fe2O4 Ferrites

The effect of Zn doping on magnetic properties of Fe 3 O 4 and CuFe 2 O 4 ferrite spinels has been studied. The general expression of saturation magnetization, the critical temperature and Curie constant ( C ) are obtained by the mean field theory (MFT). By considering the high-temperature series expansions (HTSE) theory and the mean field approximation for the Néel’s two-sublattice noncollinear model, we obtained the magnetic phase diagrams of Zn x Fe 1− x Fe 2 O 4 , and Zn x Cu 1− x Fe 2 O 4 . The Bohr magnetron is obtained for two systems. The central critical exponent γ associated with magnetic susceptibility for two systems is obtained.